8 
Tapeworms Jr ora Ostrich 
A dorsal longitudinal vessel was observed in D. beddardi, but could not be 
found in the other form. The musculature in the former is also distinctly 
weaker and more diffuse than in the latter, while at the same time not ex¬ 
tending so far into the cortex. These differences appear to indicate the 
existence of two separate species. Considering however that the scolex of the 
one form is unknown, that the definition of the other was drawn up from 
fragments, and that both came from the same species of host, the differences 
above enumerated are certainly not sufficient to justify the creation of two 
separate species for the two forms. It therefore seems best to leave this form 
unnamed until its scolex or more complete specimens of D. beddardi be 
found. 
The Genus Davainea. 
The genus Davainea was erected by Blanchard and Railliet in 1891 for 
the reception of Cestodes characterised by the possession of T-shaped rostellar 
hooks, armed suckers, and the absence of a persistent uterus. In the same 
year Blanchard (1891 a , p. 429) defined it as follows: “Vers de taille petite 
ou moyenne. Tete arrondie, surmountee d’un rostre ou creusee d’un infundi¬ 
bulum, mais armee dans l’un.et l’autre cas d’une double couronne de crochets 
nombreux, petits et d’une forme speciale. Ventouses arrondies, entourees de 
plusieurs rangees de petits crochets ou spicules, caducs ou persistant pendant 
toute la vie. Pores genitaux unilateraux ou irregulierement alternes. Dans 
l’anneau mur, d’ordinaire beaucoup de corpuscules arrondis, separes les uns 
des autres et formes d’un grand nombre d’oeufs conglomeres, depourvus 
d’appareil piriforme; parfois aussi, oeufs isoles, epars dans le parenchyme de 
l’anneau. Developpement inconnu; on suppose que la larve de certaines 
especes vit dans la cavite generale des Myriapodes et des Mollusques terrestres. 
Le Ver adulte est parasite de l’intestine grele des Oiseau (Coureurs, Gallinaces, 
Pigeons) et meme de l’Homme.” The number of species to be assigned to it 
was estimated by that author as 14, or possibly 16. Fuhrmann (1896, p. 127) 
later increased that number to 23—two of which however [ D . tauricollis 
(Chap .) = Chapmania tauricollis (Chap.) and D. (?) clavulus (v. Lins .)=Bi- 
uterina clavulus (v. Lins.)] are now placed in other genera—but “Von diesen 
23 Vertretern des Genus Davainea sind nur 10 anatomische genauer unter- 
sucht.” Since that date our knowledge of the genus has been increased 
greatly, largely owing to the work of the last named author, until in 1908 the 
number of species of Davainea from birds amounted to 59, collected from 
74 hosts (Fuhrmann, 1908). To this number must be added 31 others de¬ 
scribed in the last ten years which, together with the 16 species from mammals 
not listed by him, increases the total number to 106 from 120 hosts. 
The genus itself may now be defined as Taenioidea : 
Scolex with simple rostellum armed with a double row of very numerous 
and generally very small hammer-shaped hooks. Suckers armed or unarmed 1 . 
1 Both Ransom (1909, p. 67) and Fuhrmann (1908, p. 42) omit to state in their diagnoses 
of the genus that the suckers are sometimes unarmed ( e.g . D. cesticillus Mol.). 
